#include <iostream>
using namespace std;

int main()
{
  if (20 > 18)
  {
    cout << "20 is greater than 18" << endl;
  }

  int time = 20;

  if (time < 18)
  {
    cout << "Good day." << endl;
  }
  else
  {
    cout << "Good evening." << endl;
  }

  if (time < 10)
  {
    cout << "Good morning." << endl;
  }
  else if (time < 25)
  {
    cout << "Good day." << endl;
  }
  else
  {
    cout << "Good evening." << endl;
  }

  string result = (time < 18) ? "Good day." : "Good evening.";
  cout << result << endl;

  return 0;
}
